The drinking bird was invented in the 1940s by American chemist Miles Sullivan (patented in 1945). Once the "bird" starts drinking, it keeps swinging and "drinking" for ever. There is complex physical and chemical activity going on inside the toy, which keeps the simple heat engine running forever without a battery.  Explain the operating principle behind the Drinking Bird? (15 points)  Describe yet another tall claim for a perpetual machine and explain how it violates the Second Law of Thermodynamics? ( 10 points)

An object of dimensions 50 cm x 40 cm x 0.20 cm has a mass 60g. find its density in g/cm3 and kg/ m3

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !